An astringent (sometimes called adstringent) is a chemical that shrinks or constricts body tissues. The word derives from the Latin adstringere , which means "to bind fast". Astringency, the dry, puckering or numbing mouthfeel caused by the tannins [1] [2] in unripe fruits, lets the fruit mature by deterring eating. Tannins, being a kind of polyphenol, bind salivary proteins and make them precipitate and aggregate, [3] [4] [5] producing a rough, "sandpapery", or dry sensation in the mouth.
Squirrels, wild boars, and insects can eat astringent food as their mouths are developed to be resistant to its effects. [6]
In Ayurveda, astringent is the sixth taste (after sweet, sour, salty, pungent, bitter) represented by "air and earth". [7] [8]
Smoking tobacco is also reported to have an astringent effect. [9]
In a scientific study, astringency was still detectable by subjects who had local anesthesia applied to their taste nerves, but not when both these and the trigeminal nerves were disabled. [10]
In medicine, astringents cause constriction or contraction of mucous membranes and exposed tissues and are often used internally to reduce discharge of blood serum and mucous secretions. [11] This can happen with a sore throat, hemorrhages, diarrhea, and peptic ulcers. Externally applied astringents, which cause mild coagulation of skin proteins, dry, harden, and protect the skin. [12] People with acne are often advised to use astringents if they have oily skin. [13] Mild astringents relieve such minor skin irritations as those resulting from superficial cuts; allergies; insect bites; [12] anal hemorrhoids; [14] and fungal infections such as athlete's foot. [15] Redness-reducing eye drops contain an astringent. Use of Goulard's Extract has been discontinued due to lead poisoning.[ citation needed ]
Some common astringents are alum, acacia, sage, [16] yarrow, [17] witch hazel, bayberry, distilled vinegar, very cold water, and rubbing alcohol. Astringent preparations include silver nitrate, potassium permanganate, zinc oxide, zinc sulfate, Burow's solution, tincture of benzoin, and such vegetable substances as tannic and gallic acids. Balaustines are the red rose-like flowers of the pomegranate, which are very bitter to the taste. In medicine, their dried form has been used as an astringent. [18] Some metal salts and acids have also been used as astringents. [19]
Calamine lotion, witch hazel, and yerba mansa, are astringents, [20] as are the powdered leaves of the myrtle. [21] Ripe fruits and fruit parts including blackthorn (sloe berries), Aronia chokeberry, chokecherry, bird cherry, rhubarb, quince, jabuticaba and persimmon fruits (especially when unripe), banana skins (or unripe bananas), cashew fruits and acorns are astringent. [22] Citrus fruits, like lemons, are somewhat astringent. The tannins in some teas, coffee, and red grape wines like Cabernet Sauvignon and Merlot produce mild astringency.[ citation needed ] Astringency is used in classifications of white wine.
A mango is an edible stone fruit produced by the tropical tree Mangifera indica. It originated from the region between northwestern Myanmar, Bangladesh, and northeastern India. M. indica has been cultivated in South and Southeast Asia since ancient times resulting in two types of modern mango cultivars: the "Indian type" and the "Southeast Asian type". Other species in the genus Mangifera also produce edible fruits that are also called "mangoes", the majority of which are found in the Malesian ecoregion.
Tannins are a class of astringent, polyphenolic biomolecules that bind to and precipitate proteins and various other organic compounds including amino acids and alkaloids.
The persimmon is the edible fruit of a number of species of trees in the genus Diospyros. The most widely cultivated of these is the kaki persimmon, Diospyros kaki – Diospyros is in the family Ebenaceae, and a number of non-persimmon species of the genus are grown for ebony timber. In 2019, China produced 75% of the world total of persimmons.
Ayurveda is an alternative medicine system with historical roots in the Indian subcontinent. It is heavily practiced in India and Nepal, where around 80% of the population report using ayurveda. The theory and practice of ayurveda is pseudoscientific.
The jackfruit is the fruit of jack treeArtocarpus heterophyllus, a species of tree in the fig, mulberry, and breadfruit family (Moraceae). The jackfruit is the largest tree fruit, reaching as much as 55 kg in weight, 90 cm in length, and 50 cm in diameter. A mature jackfruit tree produces some 200 fruits per year, with older trees bearing up to 500 fruits in a year. The jackfruit is a multiple fruit composed of hundreds to thousands of individual flowers, and the fleshy petals of the unripe fruit are eaten.
Ajwain or ajowan —also known as ajowan caraway, omam , thymol seeds, bishop's weed, or carom—is an annual herb in the family Apiaceae. Both the leaves and the seed‑like fruit of the plant are consumed by humans. The name "bishop's weed" also is a common name for other plants. The "seed" is often confused with lovage seed.
Gymnema sylvestre is a perennial woody vine native to Asia, Africa and Australia. It has been used in Ayurvedic medicine. Common names include gymnema, Australian cowplant, and Periploca of the woods, and the Hindi term gurmar, which means "sugar destroyer".
Phyllanthus emblica, also known as emblic, emblic myrobalan, myrobalan, Indian gooseberry, Malacca tree, or amla, from the Sanskrit आमलकी (āmalakī), is a deciduous tree of the family Phyllanthaceae. Its native range is tropical and southern Asia.
Arctium lappa, commonly called greater burdock, gobō (牛蒡/ゴボウ), edible burdock, lappa, beggar's buttons, thorny burr, or happy major is a Eurasian species of plants in the family Asteraceae, cultivated in gardens for its root used as a vegetable. It has become an invasive weed of high-nitrogen soils in North America, Australia, and other regions.
A samskara is a process in ayurvedic medicine said to detoxify heavy metals and toxic herbs.
Coffee cupping, or coffee tasting, is the practice of observing the tastes and aromas of brewed coffee. It is a professional practice but can be done informally by anyone or by professionals known as "Q Graders". A standard coffee cupping procedure involves deeply sniffing the coffee, then slurping the coffee from a spoon so it is aerated and spread across the tongue. The coffee taster attempts to measure aspects of the coffee's taste, specifically the body, sweetness, acidity, flavour, and aftertaste. Since coffee beans embody telltale flavours from the region where they were grown, cuppers may attempt to identify the coffee's origin.
Diospyros kaki, the Oriental persimmon, Chinese persimmon, Japanese persimmon or kaki persimmon, is the most widely cultivated species of the genus Diospyros. Although its first botanical description was not published until 1780, D. kaki cultivation in China dates back more than 2000 years.
Bletting is a process of softening that certain fleshy fruits undergo, beyond ripening. There are some fruits that are either sweeter after some bletting, such as sea buckthorn, or for which most varieties can be eaten raw only after bletting, such as medlars, persimmons, quince, service tree fruit, and wild service tree fruit. The rowan or mountain ash fruit must be bletted and cooked to be edible, to break down the toxic parasorbic acid (hexenollactone) into sorbic acid.
Sattvic diet refers to a type of plant-based diet within Ayurveda where food is divided into what is defined as three yogic qualities (guna) known as sattva. In this system of dietary classification, foods that decrease the energy of the body are considered tamasic, while those that increase the energy of the body are considered rajasic. A sattvic diet is sometimes referred to as a yogic diet in modern literature.
The use of wine tasting descriptors allows the taster to qualitatively relate the aromas and flavors that the taster experiences and can be used in assessing the overall quality of wine. Wine writers differentiate wine tasters from casual enthusiasts; tasters attempt to give an objective description of the wine's taste, casual enthusiasts appreciate wine but pause their examination sooner than tasters. The primary source of a person's ability to taste wine is derived from their olfactory senses. A taster's own personal experiences play a significant role in conceptualizing what they are tasting and attaching a description to that perception. The individual nature of tasting means that descriptors may be perceived differently among various tasters.
The phenolic content in wine refers to the phenolic compounds—natural phenol and polyphenols—in wine, which include a large group of several hundred chemical compounds that affect the taste, color and mouthfeel of wine. These compounds include phenolic acids, stilbenoids, flavonols, dihydroflavonols, anthocyanins, flavanol monomers (catechins) and flavanol polymers (proanthocyanidins). This large group of natural phenols can be broadly separated into two categories, flavonoids and non-flavonoids. Flavonoids include the anthocyanins and tannins which contribute to the color and mouthfeel of the wine. The non-flavonoids include the stilbenoids such as resveratrol and phenolic acids such as benzoic, caffeic and cinnamic acids.
The aging of wine is potentially able to improve the quality of wine. This distinguishes wine from most other consumable goods. While wine is perishable and capable of deteriorating, complex chemical reactions involving a wine's sugars, acids and phenolic compounds can alter the aroma, color, mouthfeel and taste of the wine in a way that may be more pleasing to the taster. The ability of a wine to age is influenced by many factors including grape variety, vintage, viticultural practices, wine region and winemaking style. The condition that the wine is kept in after bottling can also influence how well a wine ages and may require significant time and financial investment. The quality of an aged wine varies significantly bottle-by-bottle, depending on the conditions under which it was stored, and the condition of the bottle and cork, and thus it is said that rather than good old vintages, there are good old bottles. There is a significant mystique around the aging of wine, as its chemistry was not understood for a long time, and old wines are often sold for extraordinary prices. However, the vast majority of wine is not aged, and even wine that is aged is rarely aged for long; it is estimated that 90% of wine is meant to be consumed within a year of production, and 99% of wine within 5 years.
Blumea balsamifera is a flowering plant belonging to the genus Blumea of the family Asteraceae. It is also known as Ngai camphor and sambong.
Fresh food is food which has not been preserved and has not spoiled yet. For vegetables and fruits, this means that they have been recently harvested and treated properly postharvest; for meat, it has recently been slaughtered and butchered; for fish, it has been recently caught or harvested and kept cold.
The medical ethnobotany of India is the study of Indian medicinal plants and their traditional uses. Plants have been used in the Indian subcontinent for treatment of disease and health maintenance for thousands of years, and remain important staples of health and folk medicine for millions. Indians today utilize plants for both primary medical care and as supplementary treatment alongside modern medical science. It is estimated that 70% of rural Indians use traditional plant based remedies for primary healthcare needs. This reliance of plants for medicine is consistent with trends widely observed in the developing world, where between 65% and 80% of people use medicinal plant remedies.
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